William



(ModeL) I W. C, ADAM.

COMBINED LATCH AND LOOK. N0. 359,760.- Patented M21122, 1887.

WITNESSES: INYBNTOR:

v v BY flu/m ATTORNEYS.

llNiTEo States Patent @rrrca \VILLIAM G. ADAM, OF BUFFALO, NEYV YORK.

COMBINED LATCH AND LOCK.

SPECIFICATION forming part of Letters Patent No. 359,760, dated M'arch 22, 1887.

Applicaiion filed August14,1586. Serial No. 210,924.

To all wit-mu it may concern.-

Be it known that I, WILLIAM G. ADAM, of Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in a Combined Latch and Look, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which- Figure 1 is a side elevation of my device with the cover of the casing removed. Fig. 2 is a transverse section taken on line am; in Fig. 1, and Fig. 3 is a longitudinal section taken on line 3 y in Fig. 1.

Similar letters of reference indicate corresponding parts in the different figures of the drawings.

The object of myinvent-ion is to constructa locking-latch the bolt of which may be fastened in an opened or closed position from the inside of the door or left free to be operated by a key from the outside of the door to which the latch is applied; also, to provide an arrangement of tumblers which will render it ditficult to pick the lock.

My invention consists in a spring-actuated latching-bolt provided with a cross-bar arranged to be operated by the key-nut,aud in the combination therewith of locking-levers pivoted in the lock-casing and tumblers carried by the key-nut, the locking-levers being arranged to engage the tumblers at all times ex; cept when the key is inserted in the look.

In the casing A is placed alatchingbolt, 13, provided with the beveled outer end, a, and having upon its inner end a frame, 0, carrying a crossbar, b, which is arranged at right angles to the bolt 13. The bolt B is mortised to receive a spiral spring, 0, which abuts against a post, (I, projecting from the lockcasing, and tends to press the beveled end of the bolt outward. The side of the bolt is provided with a ratchet-bar, e, and in the part of the bolt adjoining the frame 0 isjournaled a stud, f, which projects through a slot, g, in the lock-casing and receives a knob, h. The studf carries an arm, 2', which is squared on three sides and receives the pressure of an arm, j, pivoted on the stud 7c and acted on by the spring Z, wrapped around the stud 7c and abutting against the pivotal stud m of the levers p p. Vhen the arm -i is turned at right angles Model) with the bolt, the bolt may slide freely. WVlmn the bolt is moved backward by the knob h, the arm 73 is turned forward behind the stud dand the bolt will be held in an unlocked position, and when the bolt is projected and the arm 1 is turned in the opposite direction, it engages the angled end of the arm j and prevents the bolt from being withdrawn by turning the key of the lock. The arm 71 is held in either of these three positions by the pressure of the arm j on the flattened surfaces thereof.

Upon the studsnm,projecting from the latchcasing at opposite sides of the bolt B,are placed two pairs of angled lovers, 0 0, 1) p, the levers o 0' being placed on the stud n, the levers pp being placed on the studm. The shorter arms of the levers p p are forked to engage studs projecting from the shorter arms of the levers o 0', so that when the lever 0 is moved, the leverp will be moved in a similar manner, but in the opposite direction; and when the lever o is moved the lever p will be moved in a similar manner, but in an opposite direction. The levers 0 0' are provided with pawls q g, which extend forward over the ratchetbar e on the side of the bolt 13. The longer arms of the levers 0 0, 11 1) project approximately parallel with each other toward the rear end of the lock; and between the arms and the cross-bar b of the frame 0 and the body of the bolt B is journaled a key-nut, D, and the edges of the angled arms of the levers o 0, p p are formed on a circular curve, with the center of the bearing of the key-nut as a center. The key nut is provided with an oblong longitudinal mortise, and in inortises in opposite ends of the key-nut are inserted the tumblers r r, s s, which are pressed inward toward the center of the key-nut by spiral springsi t,connected with the opposing pair of tumblers. The outer ends of the tumblers 'rr, 5 s are notched to receive the inner edges of the levers 0 0, p 1;,and the inner edges of the levers p p are also notched to receive the tumblers s s, so that when the tumblers and the levers are in their normal position the tumblers s s will be re ceived and retained by the notches in the le versp p, so that the key-nut D cannot be turned until a key adapted to the lock is inserted in a mortise of the key-nut. The levers o 0', p p are pressed into engagement with the ICO for the purpose of deceiving persons who are unauthorized to use it, the object being to convey the idea that the end of the key provided with nibs is to be employed for operating the lock, while it is impossibleto operate the lock except with the end of the key provided with the'bow. \Vhen a key of this kind is lost, if

the finder is disposed to attempt to use it he will use the end of the key provided with nibs, and will be unlikely to try the opposite end.

By inserting the key in the key-nut, asshown in Fig.2, the tumblers r r are pushed outward, and by engagement with the levers 0 0 move the said levers, and through the connection of the said levers o o with the levers p 1), said levers p 1) will be moved through a greater distance, owing tothe difference in length of theshorter arms of the two systems of levers,

theshort arms of the levers 0 0 being longer than the short arms of. the levers p p,to insure therequired increase of motion to carry the longer arms of the levers p pvaway from the tumblers s 8', thus permitting the key-nut to beturned, and by its engagement with the bar I) to .withdraw the bolt B and release the door. When the key-nut D is returned to its normal position and the key withdrawn, the movable parts of the lock will return to their original position.

Should a key be inserted in the key-nut D which will not move the tumblers sufficiently to release the levers, the key-nut cannot be turned, and should a key having too great I claim as new, and desire to secure by Letters Patent, is

1. In a combined latch and lock, the combination of the spring-actuated bolt B, carrying the bar I), the key-nut D, provided with one or more spring-actuated tumblers,rs, one i or more spring-actuated levers, 0, the fixed pivot n for said levers, and one or more springactuate'd levers, p, the fixed pivot m for said levers, the levers o and 12 being pivotally conneeted, substantially as shown and described 2. In acombined latch and lock,the combination of the spring actuated bolt B, provided with the cross-bar be and ratchet-bar e, the spring actuated levers 0 0, provided with pawls q q, adapted to engage the ratchet-bar, the notched levers p 1), said levers being pivoted in the latch-case and pivotally connected with each other, and the key-nut D, journaled in the latch-casing and provided with the springactuated tumblers 1'1" 8 s, substantially as shown and described.

3. In a combined latch and lock, the combination of the casing A, provided with the stud d, the bolt B, the studf. journaledin the bolt 13 and carrying the arm 2', having flattened surfaces, and the spring-actuatedright-angled 7 arm j, bearing against said flattened surfaces,

substantially as shown and described.

4. The key E, having opposite ends adapted to enter the lock and having its bowed .end

fitted for moving the tumblers of the lock for unlocking, substantially as shown and .de scribed.

\VILLI AM 0, ADAM.

Witnesses:

CHAPIN W. JONES, P. O. DIARTIN. 

